I downloaded this mod about two weeks ago. All I can say is... IT ROCKS!
I only unzipped it yesterday, made a separate directory for it though, in case it disturbed my KMOD files, which was a good idea, seeing that you have to merge the wads using that batch file first.
You don't need jHexen to run this, it already comes with all the files it needs to run (jHexen and Doomsday wise anyway). Just unzip to a new Hexen directory (recommended), run the 'merge' .bat file, then run the .bat file that appys to you (OpenGL or Direct3D, like KMOD) I suppose that it could be run in software mode, like jDoom, if you know what command line option it is. (I've forgotten)
It has some really impressive architecture, and some really well done ACS scripting mixed together, which means that I often get distracted by the architecture, and get pasted by something. The implementation of Hexen II and Heretic enemies is very well done, although they are infuriatingly difficult to kill. It also uses a trick that I've used in some of my Doom maps (all unreleased, because I've really only started about 6-8 months ago), which is to use a texture to give the impression of a curved arch. (You know what I mean)
Shame this doesn't have Co-op, as thats my favorite game mode (but I do enjoy bashing peoples brains out in DM from time to time <!-- s:) --><img src="{SMILIES_PATH}/icon_smile.gif" alt=":)" title="Smile" /><!-- s:) --> After playing this for about an hour and a half, its given me inspiration, to make a mod a bit like it, using the jHexen game engine, just like itself.
I've already started this, by making the first building in a villiage, but I currently know absolutely nothing about ACS scripting, exept that it is used for special events/actions in Hexen, like the puzzles, and enemy spawnings etc.
I'm currently doing some mapping for Doom, but from experience, I know that the Hexen scaling (creature size compared to environment) is much different from Dooms.
Ah well, I'm still on the first hub, and this is damned hard, but I can see that a lot of effort went into it. It would be really cool to see a Hexen/Hexen Style/Hexen World MMORG (I think thats right, you should know what I mean if its not).